Packer retriever

Claim 1

A TOOL FOR REMOVING A WELL BORE PACKER COMPRISING AN ELONGATED MILLING SHOE HAVING ANNULARLY-SHAPED CUTTING MEANS ON THE LOWER END THEREOF FOR MILLING AWAY PERIPHERAL PORTIONS OF THE PACKER TO DISCONNECT SUCH PACKER FROM A WELL CASING, MEANS FOR CONNECTING THE UPPER END OF SAID MILLING SHOE TO THE LOWER END OF A DRILL STRING, A BUSHING ROTATABLE WITH SAID MILLING SHOE AND LOCATED IN COAXIAL RELATION WITHIN SAID MILLING SHOE SO THAT THE PASSAGEWAY THEREOF WILL BE IN COMMUNICATION WITH AND FORM AN EXTENSION OF THE PASSAGEWAY THROUGH A DRILL STRING, A CENTRAL SPEAR LOCATED IN COAXIAL RELATION WITH SAID MILLING SHOE AND SUPPORTED IN DEPENDING RELATION WITHIN THE LATTER BY SAID BUSHING, SAID SPEAR HAVING A LOWER PORTION ADAPTED TO MOVE AXIALLY INTO THE WELL BORE PACKER AS THE LATTER IS MILLED BY SAID SHOE, AND MEANS ON SAID LOWER PORTION FOR SECURING THE LATTER TO THE INTERIOR OF THE WELL BORE PACKER TO ENABLE REMOVAL OF THE RELEASED PACKER FROM THE WELL CASING, MEANS CONNECTING SAID CENTRAL SPEAR TO SAID BUSHING FOR LONGITUDINAL SLIDABLE MOVEMENT RELATIVE TO THE LATTER WHILE PERMITTING SAID BUSHING TO ROTATE RELATIVE TO SAID CENTRAL SPEAR, AND RADIAL PORTS IN SAID BUSHING ENABLING FLUID FLOWING IN SAID BUSHING PASSAGEWAY TO LUBRICATE THE MEANS CONNECTING SAID CENTRAL SPEAR TO SAID BUSHING SO THAT SAID SPEAR ENTERS INTO THE INTERIOR OF THE WELL BORE PACKER WITH A LENGTHWISE, SUBSTANTIALLY NON-ROTATIVE MOVEMENT, AS SAID ROTATING MILLING SHOE ADVANCES OVER THE EXTERIOR OF THE PACKER.